I personally believe the records will show there was illegal activity here, especially regarding the statutes of the Florida Sellers of Travel. I have no idea if those have any teeth or not, but they should, precisely for cases like this.
You do have a point about corporations, In this case almost all of their assets, including their homes, are in various corporations so the Burke corporations are not completely broke. The IRS did a good job of piercing the Burke's business shells in 1999.
I would say that getting people's money back will be the hardest thing about this case, but if there are still any assets (and there appear to be) I would hope at least some of it will go back to people.